Plate reduction press apparatus and methods

Abstract

A material 1 to be shaped is reduced and formed by bringing dies with convex forming surfaces, when viewed from the side of the transfer line of the material 1, close to the transfer line from above and below the material 1, in synchronism with each other, while giving the dies a swinging motion in such a manner that the portions of the forming surfaces of the dies, in contact with the material 1, are transferred from the upstream to the downstream side in the direction of the transfer line.

What is claimed is:  
     
       1. A plate reduction press apparatus comprising: 
       dies arranged above and below a slab;  
       sliders provided for each of the dies so that the dies can be moved up, down, and backwards and forwards with a swinging motion; and  
       a driving device for driving the sliders, in which each one of the sliders is comprised of a main unit with a circular hole with center lines in the lateral direction of the slab, and a crank with a first axis engaged with the circular hole and a second shaft with a diameter smaller than the diameter of the first shaft and a center line offset from the center line of the first shaft, and the second shaft is rotated and driven by the said driving device, and in which a plurality of circular holes and a plurality of cranks arranged in the sliders are arranged in a row in the transfer direction of the slab, and constructed in such a manner that each crank produces pressing force.  
     
     
       2. A plate reduction press apparatus comprising: 
       a die arranged above or below a slab;  
       sliders for moving the die up, down, and backwards and forwards;  
       a driving device for driving the sliders; and  
       a slab supporting member arranged opposite the die above or below the slab, in which  
       each one of the sliders is comprised of a main unit with a circular hole with a center line in the lateral direction of the slab, a first shaft engaged with the circular hole, and a crank comprised of a second shaft with a diameter smaller than the diameter of the first shaft and a center line offset from the center line of the first shaft, and the second shaft is rotated and driven by the driving device, in which a plurality of circular holes and a plurality of cranks arranged in the sliders are arranged in a row in the transfer direction of the slab, and constructed in such a manner that each crank produces pressing force.  
     
     
       3. The plate reduction press apparatus specified in  claim 2 , in which the said slab is transferred by pinch rolls or tables, and the slab is transferred in synchronism with the forward velocity of the sliders when the slab is pressed by the sliders. 
     
     
       4. The plate reduction press apparatus specified in  claim 2 , in which the distance L in which the slab is moved in a cycle comprised of a reduction pressing time period and a time period with a normal transfer speed is no greater than the length L 1  of the dies in the transfer direction of the slab. 
     
     
       5. A plate reduction pressing method, in the pressing method of a crank type press machine that presses a material to be pressed with upper and lower dies and transfers the material with pinch rolls, in which 
       during a pressing period, the pinch rolls rotate in such a manner that a peripheral speed of the pinch rolls is made equal to a combination of a horizontal speed of the dies and an elongation speed of the material to be pressed, added or subtracted, and transfers the material to be pressed, and  
       when the press machine is not pressing, a speed of feeding the material to be pressed is adjusted in such a manner that during one cycle, the material to be pressed is moved by a predetermined distance L, and  
       a pressing force of the pinch rolls during the pressing period is made smaller than a pressing force of the pinch rolls during the non-pressing period.  
     
     
       6. A plate reduction press apparatus comprising: 
       dies arranged above and below a material to be pressed;  
       crank devices that press each of the dies; and  
       pinch rolls that transfer the material to be pressed, in which  
       when the crank devices are pressing the material to be pressed through the dies, the pinch rolls rotate in such a manner that a peripheral speed of the pinch rolls is made equal to the combination of a horizontal speed of the dies and an elongation speed of the material to be pressed, added or subtracted, and transfers the material to be pressed, and  
       when the press machine is not pressing, a speed of feeding the material to be pressed is adjusted in such a manner that during one cycle, the material to be pressed is moved by a predetermined distance L and the distance L is not greater than a reduction length L 0  of the dies in the direction of flow of the material to be pressed, and  
       a pressing force of the pinch rolls during the pressing period is made smaller than a pressing force of the pinch rolls during the non-pressing period.  
     
     
       7. The plate thickness press apparatus specified in  claim 6 , in which 
       the pressing force of the pinch rolls is made smaller for a predetermined time t before or after the press machine begins to press.  
     
     
       8. The plate reductionpress apparatus specified in  claim 6 , in which 
       the pressing force of the pinch rolls during the pressing period is made smaller when the pressing load becomes greater than a predetermined load.  
     
     
       9. A plate reduction press apparatus comprising: 
       dies arranged above and below a slab;  
       sliders provided for each of the dies so that the dies can be moved up, down, and backwards and forwards with a swinging motion; and  
       a driving device for driving the sliders, in which each one of the sliders is comprised of a main unit with a circular hole with center lines in the lateral direction of the slab, and a crank with a first axis engaged with the circular hole and a second shaft with a diameter smaller than the diameter of the first shaft and a center line offset from the center line of the first shaft, and the second shaft is rotated and driven by the said driving device, and in which a plurality of circular holes and a plurality of cranks equipped in the sliders are arranged in a row in the transfer direction of the slab, and constructed in such a manner that one crank bears the moment of the load and the other cranks produce pressing force.  
     
     
       10. The plate reduction press apparatus specified in  claim 9 , in which 
       the slab is transferred by pinch rolls or tables, and the slab is transferred in synchronism with the forward velocity of the sliders when the slab is pressed by the sliders.  
     
     
       11. The plate reduction press apparatus specified in  claim 9 , in which 
       the distance L in which the slab is moved in a cycle comprised of a reduction pressing time period and a time period with a normal transfer speed is no greater than the length L 1  of the dies in the transfer direction of the slab.  
     
     
       12. A plate reduction press apparatus comprising: 
       a die arranged above or below a slab;  
       sliders for moving the die up, down, and backwards and forwards;  
       a driving device for driving the slider; and  
       a slab supporting member arranged opposite the said die above or below the slab, in which each one of the said sliders is comprised of a main unit with a circular hole with a center line in the lateral direction of the slab, a first shaft engaged with the circular hole, and a crank comprised of a second shaft with a diameter smaller than the diameter of the first shaft and a center line offset from the center line of the first shaft, and the second shaft is rotated and driven by the said driving device, in which a plurality of circular holes and a plurality of cranks equipped in the sliders are arranged in a row in the transfer direction of the slab, and constructed in such a manner that one crank bears the moment of the load and the other cranks produce pressing force.  
     
     
       13. The plate reduction press apparatus specified in  claim 12 , in which 
       the slab is transferred by pinch rolls or tables, and the slab is transferred in synchronism with the forward velocity of the sliders when the slab is pressed by the sliders.  
     
     
       14. The plate reduction press apparatus specified in  claim 12 , in which 
       the distance L in which the slab is moved in a cycle comprised of a reduction pressing time period and a time period with a normal transfer speed is no greater than the length L 1  of the dies in the transfer direction of the slab.